# biomechanics homework help

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• Q1: Problem 4.3 The uniform, horizontal beam shown in Figure 4.51is hinged to the wall at A and supported by a cable attached to the beam at C. C also represents the center of gravity of the beam.At the other end, the cable is attached to the wall so that it makes an angle = 68° with the horizontal. If the length of the beam is l = 4 m and the weight of the beam is W: 400 N, calculate the tension T in the cable and components of the reaction force on the beam at A.=See Answer
• Q2: Problem 4.4 Using two different cable-pulley arrangements shown in Figure 4.52, a block of weight Wis elevated to a certain height. For each system, determine how much force is applied o the person holding the cable.See Answer
• Q3: Problem 4.5 Consider the split Russel traction device and a me-chanical model of the leg shown in Figure 4.53. The leg is held in the position shown by two weights that are connected to the leg via two cables. The combined weight of the leg and the cast is W = 300 N. l is the horizontal distance between points A and B where the cables are attached to the leg. C is the center of grav-ty of the leg including the cast, which is located at a distance two-thirds of e as measured from A. The angle cable 2 makes with the horizontal is measured as ß = 45°. Determine the tensions T₁ and T₂ in the cables, weights W₁ andW₂, and angle a that cable 1 makes with the horizontal, so that the leg remains in equilibrium at the position shown.See Answer
• Q6:Question 3. 122 pts] Your team is developing a new centar implant that can be surgically implanted into the jawbone to restore a person's ability to chew. The dental implant system consists of the crown, abutment, and implant body. The implant body is a hollow tube which has an outer radius of 4 mm and inner radius of 3.5 mm. The radius of the crown and abutment can be described by the function: -0.625 2² + 4.5mm mm As a biomechanical engineer, you were asked to perform an initial analysis regarding a reactive torque throughout the implant body and possible angle of twist when the abutment is installed. You searched research articles and publicly available data and found tightening the abutment into the implant body will apply an external torque of 'T = 80 N cm to the implant body. This external torque T will cause a reactive torque on the implant body, which can be expressed by the equation of t = (kz2) N mm/mm, where z is in mm. Crown Abutment TAB== Implant Body T = 80 N-cm 2=0 Z 2 mm Jawbone N-mm mm 0000 -z² + 4.5mm B t = kz² 8 mm racy = 3.5mm BCo = 4mm (+) -0.625 TAB== 7:1771 A. [5 pts] In this scenario, determine the constant k. B. [6 pts] Determine the internal torque in each section of the implant. C. [5 pts] Determine the polar moment of inertia for each section of the implant. D. [6 pts] Set up (BUT DO NOT SOLVE) an integral to compute the total twist in the implant.See Answer
• Q7:B.. Question 4. 121 pts] You try to design a workout system for yourself for one arm preacher curl to strengthen your biceps. The system you create has three wires as shown in the figure below. Three wires are fixed to the floor. If you fix your elbow (G) to acts a pin, determine the force your biceps muscle is producing when you lift up the forearm to create a defromation of 1 cm in wire 3. Assume all the wires defrom vertically, have a diameter of 4 mm, and a Young's modulus of E-200 GPa. Assume the forearm acts as a rigid beam. Чтт meter of 4mm. 200 GPa 200x109 Pa A NAB NO Wire length: 30 cm Wire 1 -0.004 m Forearm: 40 cm B E 8 cm 8 cm D A NEF Wire 2 Wire 3 1 H 30° Nicep 90° 2 cm fo Gy Gy A. [5 pts] Draw a figure showing the forearm after deformation occurs. Then create an equation which relates the defromation in wire 3 (1 cm) to wires 1 and 2. B. [6 pts] Determine normal forces acting on wires 1, 2, and 3. C. [10 pts] Determine the bicep force and forces acting on the elbow joint. Hint: Draw a FBD of the when the forearm when its is horizontal.See Answer
• Q8: Problem 4.1 As illustrated in Figure 4.49, consider an 80 kg person preparing to dive into a pool. The diving board is rep-resented by a uniform, horizontal beam that is hinged to the ground at A and supported by a frictionless roller at D. B is a point on the board directly under the center of gravity of the person. The distance between A and B is = 6 m and the distance between A and D is d = 2 m. (Note that one-third of the board is located on the left of the roller support and two-third sis on the right. Therefore, for the sake of force analyses, one can assume that the board consists of two boards with two different weights connected at D.) If the diving board has a total weight of 1500 N, determine the reactions on the beam at A and D. See Answer
• Q9: Problem 4.2 The uniform, horizontal beam shown in Figure 4.50is hinged to the ground at A and supported by a frictionless roller at D. The distance between A and B is = 4 m and the distance between A and D is d = 3 m. A force that makes an angle B = 60° with the horizontal is applied at B. The magnitude of the applied force is P 1000 N. The total weight of the beam isW = 400 N.= By noting that three-quarters of the beam is on the left of the roller support and one-quarter is on the right, calculate the x and y components of reaction forces on the beam at A and D. See Answer
• Q10: 6. A person is performing a set of squats. The time for the upward movement and the downward movement is the same, assume that when squatting down no work is performed. h1= 0.5m (initial height of total center of mass) h2=1.6 m (final height of total center of mass) t=1.2 s (time to go from h1 to h2) n=8 (number of repetitions) trợr-19.2s (total time) m=62kg (mass of the person) m2=50kg (mass of the barbell) mechanical work performed per repetition total mechanical work average power per repetition total average power total average power per kg of body massSee Answer
• Q11:1- Write an essay on the importance of anthropometry and how anthropometric data can be used in the design of workplaces to protect the workers from work-related musculoskeletal disorders.See Answer
• Q12:Section III: Consider the picture of the diners below. You can see that the man would benefit from leaning forward while eating. Fill-in your answers to the questions in the table that are related to the scenario in the picture. (10 Points) For this section, consider the man in the picture (4 points): 1. What motions are required at each of the following joints for this man to be able to lean forward? (2 points) 2. Name one muscle that could be strengthened so this segment can move in the intended direction. (2 points) Thoracic & Lumbar Vertebrae For this section, consider the woman compared to the man (4 points): 3. How are the woman's cervical vertebrae moving in a different motion than the man? In other words, what does she do with her neck while leaning forward to eat that the man does not? (you may want to experiment recreating the motions yourself) (2 points) 4. What motion is different between the woman's thoracic spine position and the man's? (2 points) Woman's Hip Joint Man's/nSection II: Consider the picture of the young girl using scissors. Answer the questions in the table, associated with the joints and muscles involved in this activity. Limit your analysis to the closing phase of scissor use rather than the opening phase. (15 points) 1. Name the motion being used. (4 points) 2. Name one muscle contributing to the motion above (4 points) 3. Name the main nerve that innervates each of your chosen muscles (4 points) Right Wrist Joint Right Finger MCP Joints Right Finger PIP Joints Right Thumb CMC & MCP JointsSee Answer

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